Update Enwik8 broken link and information (#4950)

* Update enwik8 fixing the broken link

* Update enwik8 README file sizes

Commit from https://github.com/huggingface/datasets/commit/c7e540d2791a6eff7bdd5d5ecf029ed0da35802e

README.md

@@ -49,19 +49,19 @@ task_ids:
 
 ## Dataset Description
 
-- **Homepage:** https://cs.fit.edu/~mmahoney/compression/textdata.html
+- **Homepage:** http://mattmahoney.net/dc/textdata.html
 - **Repository:** [Needs More Information]
 - **Paper:** [Needs More Information]
-- **Leaderboard:** [Needs More Information]
+- **Leaderboard:** https://paperswithcode.com/sota/language-modelling-on-enwiki8
 - **Point of Contact:** [Needs More Information]
 
 ### Dataset Summary
 
-The enwik8 datasset is based on Wikipedia and is typically used to measure a model's ability to compress data. The data come from a Wikipedia dump from 2006.
+The enwik8 dataset is the first 100,000,000 (100M) bytes of the English Wikipedia XML dump on Mar. 3, 2006 and is typically used to measure a model's ability to compress data.
 
 ### Supported Tasks and Leaderboards
 
-[Needs More Information]
+A leaderboard for byte-level causal language modelling can be found on [paperswithcode](https://paperswithcode.com/sota/language-modelling-on-enwiki8)
 
 ### Languages
 
@@ -71,9 +71,9 @@ en
 
 ### Data Instances
 
-- **Size of downloaded dataset files:** 33.39 MB
-- **Size of generated dataset files:** 99.47 MB
-- **Total size:** 132.86 MB
+- **Size of downloaded dataset files:** 34.76 MB
+- **Size of generated dataset files:** 97.64 MB
+- **Total size:** 132.40 MB
 
 ```
 {
@@ -110,7 +110,7 @@ The data fields are the same among all sets.
 
 #### Initial Data Collection and Normalization
 
-[Needs More Information]
+The data is just English Wikipedia XML dump on Mar. 3, 2006 split by line for enwik8 and not split by line for enwik8-raw.
 
 #### Who are the source language producers?
 
@@ -160,4 +160,4 @@ Dataset is not part of a publication, and can therefore not be cited.
 
 ### Contributions
 
-Thanks to [@HallerPatrick](https://github.com/HallerPatrick) for adding this dataset.
+Thanks to [@HallerPatrick](https://github.com/HallerPatrick) for adding this dataset and [@mtanghu](https://github.com/mtanghu) for updating it.

dataset_infos.json

@@ -1 +1 @@
-{"enwik8": {"description": "The dataset is based on the Hutter Prize (http://prize.hutter1.net) and contains the first 10^8 byte of Wikipedia\n", "citation": "", "homepage": "https://cs.fit.edu/~mmahoney/compression/textdata.html", "license": "", "features": {"text": {"dtype": "string", "id": null, "_type": "Value"}}, "post_processed": null, "supervised_keys": null, "task_templates": null, "builder_name": "enwik8", "config_name": "enwik8", "version": {"version_str": "1.1.0", "description": null, "major": 1, "minor": 1, "patch": 0}, "splits": {"train": {"name": "train", "num_bytes": 104299244, "num_examples": 1128024, "dataset_name": "enwik8"}}, "download_checksums": {"http://cs.fit.edu/~mmahoney/compression/enwik8.zip": {"num_bytes": 35012219, "checksum": "9591b88a79ef28eeef58b6213ffbbc1b793db83d67b7d451061829b38e0dcc69"}}, "download_size": 35012219, "post_processing_size": null, "dataset_size": 104299244, "size_in_bytes": 139311463}, "enwik8-raw": {"description": "The dataset is based on the Hutter Prize (http://prize.hutter1.net) and contains the first 10^8 byte of Wikipedia\n", "citation": "", "homepage": "https://cs.fit.edu/~mmahoney/compression/textdata.html", "license": "", "features": {"text": {"dtype": "string", "id": null, "_type": "Value"}}, "post_processed": null, "supervised_keys": null, "task_templates": null, "builder_name": "enwik8", "config_name": "enwik8-raw", "version": {"version_str": "1.1.0", "description": null, "major": 1, "minor": 1, "patch": 0}, "splits": {"train": {"name": "train", "num_bytes": 100000004, "num_examples": 1, "dataset_name": "enwik8"}}, "download_checksums": {"http://cs.fit.edu/~mmahoney/compression/enwik8.zip": {"num_bytes": 35012219, "checksum": "9591b88a79ef28eeef58b6213ffbbc1b793db83d67b7d451061829b38e0dcc69"}}, "download_size": 35012219, "post_processing_size": null, "dataset_size": 100000004, "size_in_bytes": 135012223}}
+{"enwik8": {"description": "The dataset is based on the Hutter Prize (http://prize.hutter1.net) and contains the first 10^8 bytes of English Wikipedia in 2006 in XML\n", "citation": "", "homepage": "http://mattmahoney.net/dc/textdata.html", "license": "", "features": {"text": {"dtype": "string", "id": null, "_type": "Value"}}, "post_processed": null, "supervised_keys": null, "task_templates": null, "builder_name": "enwik8", "config_name": "enwik8", "version": {"version_str": "1.1.0", "description": null, "major": 1, "minor": 1, "patch": 0}, "splits": {"train": {"name": "train", "num_bytes": 104299244, "num_examples": 1128024, "dataset_name": "enwik8"}}, "download_checksums": {"http://mattmahoney.net/dc/enwik8.zip": {"num_bytes": 36445475, "checksum": "547994d9980ebed1288380d652999f38a14fe291a6247c157c3d33d4932534bc"}}, "download_size": 36445475, "post_processing_size": null, "dataset_size": 102383126, "size_in_bytes": 138828601}, "enwik8-raw": {"description": "The dataset is based on the Hutter Prize (http://prize.hutter1.net) and contains the first 10^8 bytes of English Wikipedia in 2006 in XML\n", "citation": "", "homepage": "http://mattmahoney.net/dc/textdata.html", "license": "", "features": {"text": {"dtype": "string", "id": null, "_type": "Value"}}, "post_processed": null, "supervised_keys": null, "task_templates": null, "builder_name": "enwik8", "config_name": "enwik8-raw", "version": {"version_str": "1.1.0", "description": null, "major": 1, "minor": 1, "patch": 0}, "splits": {"train": {"name": "train", "num_bytes": 100000008, "num_examples": 1, "dataset_name": "enwik8"}}, "download_checksums": {"http://mattmahoney.net/dc/enwik8.zip": {"num_bytes": 36445475, "checksum": "547994d9980ebed1288380d652999f38a14fe291a6247c157c3d33d4932534bc"}}, "download_size": 36445475, "post_processing_size": null, "dataset_size": 100000008, "size_in_bytes": 136445483}}

enwik8.py

@@ -21,16 +21,16 @@ _CITATION = ""
 
 # You can copy an official description
 _DESCRIPTION = """\
-The dataset is based on the Hutter Prize (http://prize.hutter1.net) and contains the first 10^8 byte of Wikipedia
+The dataset is based on the Hutter Prize (http://prize.hutter1.net) and contains the first 10^8 bytes of English Wikipedia in 2006 in XML
 """
 
-_HOMEPAGE = "https://cs.fit.edu/~mmahoney/compression/textdata.html"
+_HOMEPAGE = "http://mattmahoney.net/dc/textdata.html"
 
 _LICENSE = ""
 
 # The HuggingFace Datasets library doesn't host the datasets but only points to the original files.
 # This can be an arbitrary nested dict/list of URLs (see below in `_split_generators` method)
-_URLS = {"source": "http://cs.fit.edu/~mmahoney/compression/enwik8.zip"}
+_URLS = {"source": "http://mattmahoney.net/dc/enwik8.zip"}
 
 
 class Enwik8(datasets.GeneratorBasedBuilder):